JPH0230428A - Wire discharge processing machine - Google Patents

Abstract

PURPOSE:To perform high accuracy discharge processing without the generation of foggy mist, by forming a conical liquid curtain forming device to form a conical injection film. CONSTITUTION:A conical liquid curtain W1 of processing liquid is formed around an upper side guide block 4, by a conical liquid curtain forming device 15. Splashing of the processing liquid that is injected into a discharge part is prevented through the processing liquid accumulated in the curtain, and the possibility of the generation of foggy mist is thus eliminated. Further, since the processing liquid is accumulated in the conical liquid curtain W1 the means for preventing the splash is never to be caught in the upper side guide block 4 and a work piece 6 to break a wire discharge processing machine, not to deteriorate processing accuracy.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a wire electrical discharge machine, and particularly to a wire electrical discharge machine with improved means for preventing scattering of machining fluid.

[Conventional technology]

A wire electrical discharge machine generates electrical discharge between a wire serving as a machining electrode and a workpiece to machine the workpiece into a desired shape. In such a wire electric discharge machine, pressurized machining fluid is injected into the discharge part in order to cool the discharge part and remove machining debris produced by the discharge. However, the injected machining fluid collides with the surface of the workpiece and scatters all over the surface. Therefore, things near the wire electric discharge machine will be covered with the machining fluid, which is not preferable. Therefore, means are provided to prevent the machining fluid from scattering. FIG. 3 shows a conventional wire electrical discharge machine. In Fig. 3, 1 is a wire, 2 is a roller, 3 is a conductor, 4 is an upper guide bronck, 5 is a lower guide block, 6 is a workpiece, 7 is a power source for machining, 8 is a machining tank, 8-1 9 is a discharge port, 9 is a processing fluid supply tank, 91 is a first tank, 9-2 is a second tank, 10
is a filter, 11 is a liquid sending pipe, 2 is a conductor, 13 is a support, 4 is a scattering prevention sheet, 17 is a guide, Pl, P
2 is the pump, and A is the scattering direction. A voltage for generating electric discharge is applied to the wire 1 from a machining power source 7 via a conductor 3. Workpiece 6
is applied directly from the processing die "a7". The wire 1 is moved in the direction of the arrow while being guided in its running position by the guide 17. The workpiece 6 is placed on a moving table (not shown). The wire 1 is moved relative to the wire 1. By this relative movement, it is machined into a desired shape. The machining fluid injected into the discharge part is pressurized by the pump P, and passes through the liquid pipe 11 to the upper part. Guide block 4.
It is fed into the lower guide block 5. Arrow A indicates the scattering direction of the injected machining fluid. The scattering range of objects that collide with the lower surface of the workpiece 6 is narrow and does not pose much of a problem, but the scattering range of objects that collide with the upper surface is wide and this wets nearby objects. The machining fluid that has fallen into the machining tank 8 is sent to the first tank 9-1 of the machining fluid supply tank 9 through the discharge port 8-1. And pump P
2, it is sent to the second tank 9-2 via the filter 10. Since dust such as machining chips is removed by the filter 10, the machining fluid in the second tank 9-2 is clean. This is carried out by the pump P and the upper guide roller 4. Sent to lower guy 1 block 5. The support 13 and the anti-scattering sort 14 are
This was designed to prevent i-defeat on the J-, surface. The support body 13 is a plate material and covers two sides of the processing section. A shatterproof notebook 14 is suspended around the support 13. A flexible sheet (for example, a rubber sheet, etc.) is used for the scattering prevention sheet +14. Workpiece 6 is covered with scattering prevention sheet 1
This is because when it moves to the workpiece 4, it contacts the workpiece 6 without giving an impact and lies on the upper surface of the workpiece 6, and when it moves away from the workpiece 6, it hangs down vertically. The machining liquid that has been scattered in the direction of arrow A is prevented from scattering outside by the scattering prevention sheet 14.

[Problem to be solved by the invention]

(Problems) However, the above-mentioned conventional technology has the following problems. The first problem is that the anti-scattering sheet may damage the wire electrical discharge machine or impair machining accuracy during machining. The second problem is that the mist of the machining fluid is scattered into the working chamber. (Description of Problem) First, the first problem will be explained. If the scattering prevention sheet 14 is long, when the workpiece 6 moves,
It may be caught between the upper guide block 4 and the upper surface of the workpiece 6. Then, the relative position between the wire 1 and the workpiece 6 may be different from the desired one, which impairs machining accuracy. Furthermore, if the wire electrical discharge machine is forcibly operated with the wire caught, the wire electrical discharge machine may be damaged. Next, the second problem will be explained. When the machining fluid collides with the anti-scattering sheath 1, a portion of it becomes mist due to the impact. This floats and spreads in the room where the wire electrical discharge machine is installed, worsening the working environment. An object of the present invention is to solve the above-mentioned problems.

[Means to solve the problem]

In order to solve the above problem, the wire electrical discharge machine of the present invention is provided with a conical liquid curtain forming device that forms a conical sprayed film in order to create a pool of JJTIT liquid around the soil guide block. did.

[For production]

Due to the conical liquid curtain of machining liquid formed around the upper guy 1-block by the conical liquid curtain forming device, the machining liquid accumulated inside the conical liquid curtain is sprayed 1 to the discharge part 7a.
・Has the effect of preventing the high-pressure machining fluid from scattering. In addition, since the scattering prevention means is a conical liquid curtain, the liquid accumulated inside the curtain may get caught between the upper guide block and the workpiece, damaging the wire electric discharge machine or impairing machining accuracy. There is nothing to do.

【Example】

Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 shows a wire electrical discharge machine according to an embodiment of the present invention. The symbols correspond to those in FIG. 15 is a conical liquid curtain forming device, 15-1
16 is a nozzle part, 16 is a liquid reservoir part, P3 is a pump, and Wl is a conical liquid curtain. The parts corresponding to Figure 3 are shown in Figure 3.
It works similar to the previous one. The conical liquid curtain forming device 15 is a donut-shaped pipe, and is arranged so as to surround the upper guide block 4. At the bottom of the conical liquid curtain forming device]5,
A nozzle section 15-1 is provided. Nozzle section 15 in FIG.
The direction of −1 is slightly inward to form a conical shape. Processing liquid is supplied to the conical liquid curtain forming device 15 from a liquid reservoir 16 provided at the bottom of the processing tank 8 by a pump P3. This machining fluid is a recovered machining fluid mixed with dust such as machining waste. This is to prevent scattering, so it does not matter if some dust is mixed in. Of course, clean machining liquid from the second tank 9-2 may be used, but in this case the capacity of the filter 10 must be greatly increased, resulting in increased cost. The machining fluid in the conical liquid curtain forming device 15 is discharged from the nozzle portion 15-1 to form a conical liquid curtain W around the upper guide block 4. Therefore,
'' The scattering of the machining fluid injected into the discharge section through the two-part guide block 4 is blocked by the liquid curtain W1. FIG. 2 shows an example of the orientation of the nozzle portion of the conical liquid curtain forming device. FIG. 2(a) shows the present invention in which the nozzle portion 15-1 is directed inward, as shown in FIG. 1, and FIG. The nozzle portion 15-1 is directed directly downward. When the nozzle part 15-1 is oriented inward, the amount of the central pooled liquid W2 is larger than when the nozzle part 15-1 is oriented directly downward. Since the central pooled liquid W2 receives the machining liquid injected at high pressure, the larger the amount, the more the force of the injection can be weakened, and the scattering can be reduced. Therefore, the direction of the nozzle section 5-1 is determined as appropriate, taking into consideration the pressure and amount of the machining fluid to be injected. Moreover, the central pooled liquid W2 also gives an effect similar to immersion electric discharge machining (electric discharge machining performed while the workpiece is immersed in the machining liquid) to the discharge gap. That is, it prevents air bubbles from entering the discharge gap and increases the machining speed.

【Effect of the invention】

As described above, the present invention provides the following effects. ■ The scattering prevention means will not damage the electrical discharge machine or degrade machining accuracy. Since the conical liquid curtain, which is the scattering prevention means, is a liquid, it will not get caught between the upper guide block and the workpiece during machining like the conventional scattering prevention curtain).
This is because it is impossible. ■ The mist does not start. Collision between machining fluid and its splashes that is injected at high pressure is caused by
It is a liquid such as a central pool liquid or a cone-shaped liquid curtain.
The soft uke can be stopped. Therefore, no atomized mist is generated by the anti-scattering means.

[Brief explanation of the drawing]

Figure 1: A wire electrical discharge machine according to an embodiment of the present invention. Figure 2: An example of the orientation of the nozzle part of a conical liquid curtain forming device. Figure 3: A diagram of a conventional wire electrical discharge machine. , 1 is a wire, 2 is a roller, 3 is a conductor, 4
1 is an upper guide block, 5 is a lower guide block, 6 is a workpiece, 7 is a processing power source, 8 is a processing tank, 8-1 is a discharge port, 9 is a processing fluid supply tank, 91 is a first tank, 9-2 is the second tank,
10 is a filter, 11 is a liquid sending vibrator, 12 is a conductor, 13
14 is a support, 14 is a scattering prevention sheet, 15 is a conical liquid curtain forming device, 15-1 is a nozzle part, 16 is a liquid reservoir part,
17 is a guide, P to P3 are pumps, A is a scattering direction, Wl is a conical liquid curtain, and W2 is a central pool of liquid.

Claims (1)

[Claims] A wire electric discharge machine characterized by being provided with a conical liquid curtain forming device that forms a conical spray film to create a pool of machining liquid around an upper guide block.